An OTG Support Android phone.
An OTG cable.
Modem with a SIM.
PPP Widget 2 (Play store to download the Quick Connect)
Download and install the ppp widget 2. Widget from the home screen and bring it.
OTG Support Android phones with modem tried to show the process of using the net. I do not know if I could convey to you the right way. Even if you know you are in trouble if the video does not.
Click here to download link